Also, just something to keep in mind, but many of us use vintage regulators on 3,000 PSI tanks. My Mistral, as an example, has been rebuilt 1 time in 8 years and it is the regulator that I use on every dive vacation on rental AL80 tanks. I know that is anecdotal. The US Navy also routinely used 3,000 PSI tanks on vintage regulators. The frequently asked questions, or FAQ, are helpful:
http://vintagedoublehose.com/faq/
The FAQ covers tons of stuff, but it does also cover using vintage tanks on 3,000 PSI tanks. I just want to share what is accepted best practice in our community.
Also, one last point. I wholeheartedly support the community's new parts, include the duckbill eliminator and various other parts. You can absolutely dive these regulators as they came, provided that you replace any perished parts in them. I don't own a single duckbill eliminator, a single HPR upgrade, a cyclone first stage, or any of that stuff. I have 10 double hose regulators, and they dive just fine. I just don't want you to get scared off by the money aspect. You can rebuild one of these regulators into "as they came" condition, and they dive wonderfully for many of us.
Last week, I dove a Navy Type DA to 122 feet. That regulator doesn't even have a venturi assist. They are still entirely serviceable. Now, don't let me scare you off from the new parts. They make the regulators easier to dive, easier to clean, and easier to keep running. The benefits of the new parts, to Bryan's point, are not deniable. Just don't think that your gear is unsafe or inadequate in its present state, provided you place serviceable maintenance parts in it, because it isn't. I know that's a lot of information. Think of this as placing a headers on a car that already ran well with manifolds, but will be faster and cooler with headers. Like Herman said, any and all of these are easily reversible if you want to make your regulator as issued.
I do also have an Argonaut Kraken, and it is by far my favorite piece of gear. It almost pains me to say this as a diehard vintage equipment guy, but I have to fight back the urge to use it all the time because of how nicely it breathes. These things are like anything else though man, including nice watches, good guns, and nice cars. You can own and appreciate them all in different ways. My Navy Type DA is a real classic, but its work of breathing isn't even in the same baseball stadium as my Kraken. It's like being able to drive a 1965 Mustang and a 2016 Mustang and appreciate both for their peculiarities. I know you guys get what I'm saying
Enjoy, and welcome!
The impossible missions are the only ones which succeed. -JYC